US20190023078A1 - Tire having noise-reducing tread pattern - Google Patents
Tire having noise-reducing tread pattern Download PDFInfo
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- US20190023078A1 US20190023078A1 US15/657,620 US201715657620A US2019023078A1 US 20190023078 A1 US20190023078 A1 US 20190023078A1 US 201715657620 A US201715657620 A US 201715657620A US 2019023078 A1 US2019023078 A1 US 2019023078A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0318—Tread patterns irregular patterns with particular pitch sequence
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C2200/00—Tyres specially adapted for particular applications
- B60C2200/14—Tyres specially adapted for particular applications for off-road use
Definitions
- the present disclosure relates generally to a noise-reducing tread pattern including a plurality of tread elements and, more particularly, to tread elements having one of three different pitches, which are configured circumferentially according to a particular pitch sequence.
- the mud terrain market is understood in the industry to apply to vehicles or machines where aggressive off-road usage is common or where usage in mud, rock, sand, and/or gravel predominates. Due to these aggressive applications, the tread elements of off-road tires are generally much larger to allow for improved survivability in conditions which are harsher than those experienced by passenger vehicles or other on-road vehicles. However, when vehicles with mud terrain tires are applied to on-road usage, these open and larger type tread elements may have a generally objectionable noise level as the tire contacts the road pavement at various speeds and vehicle loads.
- U.S. Pat. No. 9,327,558 to Stuckey et al. is agricultural related and directed to a tire including a tread extending circumferentially about a tire carcass.
- the tread includes a plurality of tread elements disposed in a tread pattern.
- the tread elements have one of two different pitch lengths and are disposed in a noise-reducing pitch sequence.
- a tire in one aspect, includes a tire carcass, and a tread extending circumferentially about the tire carcass and including a noise-reducing tread pattern.
- the noise-reducing tread pattern includes a plurality of tread elements, with the tread elements having a first pitch length (1), a second pitch length (2), or a third pitch length (3).
- the noise-reducing tread pattern includes one of the following circumferential configurations: a circumferential row including 40 pitches, with 13 occurrences of “1,” 13 occurrences of “2,” and 14 occurrences of “3;” a circumferential row including 38 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 9 occurrences of “3;” a circumferential row including 42 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 13 occurrences of “3;” and a circumferential row including 44 pitches, with 11 occurrences of “1,” 20 occurrences of “2,” and 13 occurrences of “3.”
- an off-road vehicle in another aspect, includes a frame, and a set of tires mounted on the frame and having a noise-reducing tread pattern.
- the noise-reducing tread pattern may include a plurality of tread elements, with the tread elements having a first pitch length, a second pitch length, or a third pitch length.
- the noise-reducing tread pattern includes one of the following circumferential configurations: a circumferential row including 40 pitches, with 13 occurrences of “1,” 13 occurrences of “2,” and 14 occurrences of “3;” a circumferential row including 38 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 9 occurrences of “3;” a circumferential row including 42 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 13 occurrences of “3;” and a circumferential row including 44 pitches, with 11 occurrences of “1,” 20 occurrences of “2,” and 13 occurrences of “3.”
- a method of manufacturing a mud terrain tire having a noise-reducing tread pattern includes forming a tread configured to extend circumferentially about a tire carcass, with the tread including the noise-reducing tread pattern.
- the noise-reducing tread pattern includes a plurality of tread elements, with the tread elements having a first pitch length (1), a second pitch length (2), or a third pitch length (3).
- the noise-reducing tread pattern includes one of the following circumferential configurations: a circumferential row including 40 pitches, with 13 occurrences of “1,” 13 occurrences of “2,” and 14 occurrences of “3;” a circumferential row including 38 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 9 occurrences of “3;” a circumferential row including 42 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 13 occurrences of “3;” and a circumferential row including 44 pitches, with 11 occurrences of “1,” 20 occurrences of “2,” and 13 occurrences of “3.”
- FIG. 1 is a side diagrammatic view of an off-road vehicle, according to an exemplary embodiment of the present disclosure
- FIG. 2 is a perspective view of a tire of the vehicle of FIG. 1 , having a noise-reducing tread pattern in accordance with the present disclosure
- FIG. 3 is a perspective view of the tread portion of the tire of FIG. 2 ;
- FIG. 4 is a flattened tread section illustrating a portion of an exemplary noise-reducing tread pattern, according to the present disclosure
- FIG. 5 is a flattened tread section of a single pitch of the noise-reducing tread pattern of FIG. 4 , according to the present disclosure
- FIG. 6 is a graphical representation of a harmonic spectrum analyzing an exemplary tire having a noise-reducing tread pattern according to the present disclosure.
- FIG. 7 is a graphical representation of a harmonic spectrum analyzing an exemplary mono pitch tire.
- the off-road vehicle 10 may be any type of vehicle capable of driving on and off paved or gravel surfaces, for example. It is generally characterized by having large tires with deep, open treads.
- the off-road vehicle 10 includes a frame 12 supporting a set of tires 14 , which are mounted on the frame 12 .
- the tires 14 are configured to transfer the load of the off-road vehicle 10 to the ground through the tires 14 , which may be mud terrain tires, or other similar off-road tires.
- the frame 12 may also support an engine 16 , an operator compartment or cab 18 , and a body 20 , along with various other systems and/or components.
- the tire 14 may be a pneumatic tire, for example, and may have any of a variety of different configurations and/or constructions.
- the tire 14 may include a carcass, or body, 30 , having an axis of rotation A.
- the carcass 30 , or tire 14 may generally include a crown 32 , which may represent a center tread area of the tire 14 and may extend circumferentially about the carcass 30 .
- a first sidewall 34 may include a vertical portion of the tire 14 extending radially inwardly from the crown 32 to a first bead 36 .
- a second sidewall 38 may be vertically oriented and may extend radially inwardly from the crown 32 to a second bead 40 .
- First and second shoulders 42 , 44 may include the areas where the crown 32 meets the respective one of the first and second sidewalls 34 , 38 .
- the first and second beads 36 , 40 may secure the tire 14 in place on a rim or wheel (not shown).
- the crown 32 along with the first and second sidewalls 34 , 38 , may define a tire chamber 46 suitable for containing a quantity of pressurized air in a conventional manner, such as, for example, by mounting the first and second beads 36 , 40 in a substantially fluid-tight manner on a rim or wheel.
- the tire carcass 30 may be of any suitable construction and may be made from any suitable materials. Examples of materials may include synthetic rubber, natural rubber, fabric and wire, along with carbon black and other chemical compounds.
- Tread 48 which may be formed about the tire carcass 30 and may extend circumferentially about the axis A of the tire carcass 30 , is shown removed from the rest of the tire 14 in FIG. 3 .
- the tread 48 may include a plurality of tread elements, or lugs, 60 , and voids, or spaces, 62 between the tread elements 60 .
- the tread elements 60 may project outwardly from the tire 14 , with the voids 62 being recessed relative to the tread elements 60 .
- Tread elements 60 of a mud terrain tire, such as tire 14 are typically larger than those of an on-road tire. Both the tread elements 60 and the voids 62 may have any of a variety of different shapes, sizes, and/or configurations, with an arrangement of the tread elements 60 and the voids 62 forming a tread pattern 64 around the tire 14 .
- the tread pattern 64 which, as taught herein, is a noise-reducing tread pattern, 64 , will be discussed in greater detail.
- the noise-reducing tread pattern 64 may be applicable to mud terrain type tread and other off-road tread.
- the tread pattern 64 may include one or more circumferentially extending rows 70 , 72 , 74 , 76 of tread elements 60 that form a loop pattern of tread elements 60 around the exterior of the tire 14 .
- the tread 48 may be divided into a predetermined number of pitches P 1 , P 2 , P 3 of varying pitch lengths 1, 2, 3.
- Each of the pitches P 1 , P 2 , P 3 includes a tread element 60 and an adjacent void 62 , as shown, and the pitch length 1, 2, 3 is a circumferential length or measure of each pitch P 1 , P 2 , P 3 .
- Each of the pitches P 1 , P 2 , P 3 spans between shoulders 42 , 44 of the tire 14 , and each pitch P 1 , P 2 , P 3 has a circumferential length corresponding to one of the pitch lengths 1, 2, 3.
- a single exemplary pitch P 1 having pitch length 1 is shown in FIG. 5 .
- the tread 48 may be divided into 40 pitches P 1 , P 2 , P 3 having three different pitch lengths 1, 2, 3.
- the tread elements 60 , and surrounding voids 62 which make up the pitches P 1 , P 2 , P 3 , may have a first pitch length 1, a second pitch length 2, or a third pitch length 3 around the tire 14 .
- the first pitch length 1, the second pitch length 2, and the third pitch length 3 may have a pitch ratio within a range of between about 0.85 to 1.15.
- the first pitch length 1 may be approximately 85% of the second pitch length 2, which may be defined as 100%
- the third pitch length 3 may be defined as 115% of the second pitch length 2.
- the tread elements 60 having the first pitch length 1 may be substantially identical, the tread elements 60 having the second pitch length 2 may be substantially identical, and the tread elements 60 having the third pitch length 3 may be substantially identical.
- the noise-reducing tread pattern 64 of the present disclosure may include the circumferential arrangement of the pitches P 1 , P 2 , P 3 according to particular pitch sequences. That is, as described below, the tread pattern 64 may include the pitches P 1 , P 2 , P 3 arranged about the tire 14 such that a specific predetermined sequence is followed.
- the tread pattern 64 may include the pitches P 1 , P 2 , P 3 arranged about the tire 14 such that a specific predetermined sequence is followed.
- a circumferential row including 42 pitches with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 13 occurrences of the third pitch length; and wherein the circumferential row including 42 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
- a circumferential row including 44 pitches with 11 occurrences of the first pitch length, 20 occurrences of the second pitch length, and 13 occurrences of the third pitch length; wherein the circumferential row including 44 pitches, with 11 occurrences of the first pitch length (1), 20 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
- FIG. 6 includes a graphical representation 80 of a harmonic spectrum 82 analyzing an exemplary tire, such as tire 14 , having the noise-reducing tread pattern 64 according to the present disclosure.
- the harmonic spectrum 82 may be generated from a computer-based simulation of one of the above pitch sequences.
- FIG. 7 is a graphical representation 90 of a harmonic spectrum 92 analyzing an exemplary mono pitch tire. As shown, the amplitude level corresponding to the noise-reducing tread pattern 64 in FIG. 6 may be significantly reduced versus that corresponding to the mono pitch tire in FIG. 7 .
- the present disclosure relates generally to tires. More particularly, the present disclosure is directed to mud terrain tires and/or other off-road tires. Further, the present disclosure is directed to treads and tread patterns on tires, and reducing noise, or pattern noise, generated as a result of contact of the tire tread on pavement.
- the mud terrain market applies to vehicles or machines where aggressive off-road usage is common. Due to the aggressive application, the tread elements are generally much larger to allow for improved survivability in conditions which are harsher than those experienced by typical on-road vehicles. However, when vehicles with mud terrain tires are applied to on-road usage, these open and larger type tread elements may have a generally objectionable noise level as the tire contacts the road pavement at various speeds and vehicle loads.
- an exemplary tire 14 of the present disclosure may include a carcass 30 having an axis of rotation A.
- the carcass 30 may generally include a crown 32 extending circumferentially about the carcass 30 , a first sidewall 34 extending radially inwardly from the crown 32 to a first bead 36 , and a second sidewall 38 extending radially inwardly from the crown 32 to a second bead 40 .
- First and second shoulders 42 , 44 may include areas where the crown 32 meets the respective one of the first and second sidewalls 34 , 38 .
- the first and second beads 36 , 40 may secure the tire 14 in place on a rim or wheel.
- Tread 48 may extend circumferentially about the axis A of the tire carcass 30 , and may include a plurality of tread elements 60 and voids 62 between the tread elements 60 .
- An arrangement of the tread elements 60 and the voids 62 may form a tread pattern 64 , also referred to as a noise-reducing tread pattern, around the tire 14 .
- the noise-reducing tread pattern 64 may be applicable to mud terrain type tread and other off-road tread.
- the tread pattern 64 may be divided into a predetermined number of pitches P 1 , P 2 , P 3 , which may span laterally between shoulders 42 , 44 and may have one of three pitch lengths 1, 2, 3.
- the pitch lengths 1, 2, 3 may be measured circumferentially about the tire 14 .
- the noise-reducing tread pattern 64 may include a plurality of tread elements 60 , with the tread elements 60 having the first pitch length 1, the second pitch length 2, or the third pitch length 3. Further, the first pitch length 1, the second pitch length 2, and the third pitch length 3 may have a pitch ratio within a range of between about 0.85 to 1.15. For example, the first pitch length 1 may be approximately 85% of the second pitch length 2, which may be defined as 100%, and the third pitch length 3 may be defined as 115% of the second pitch length 2.
- the noise-reducing tread pattern 64 of the present disclosure may include the circumferential arrangement of the pitches P 1 , P 2 , P 3 according to particular pitch sequences. That is, the tread pattern 64 may include the pitches P 1 , P 2 , P 3 arranged about the tire 14 such that a specific predetermined sequence of pitch lengths 1, 2, 3 is followed.
- pitches P 1 , P 2 , P 3 arranged about the tire 14 such that a specific predetermined sequence of pitch lengths 1, 2, 3 is followed.
- a circumferential row including 42 pitches with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 13 occurrences of the third pitch length; and wherein the circumferential row including 42 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
- a circumferential row including 44 pitches with 11 occurrences of the first pitch length, 20 occurrences of the second pitch length, and 13 occurrences of the third pitch length; wherein the circumferential row including 44 pitches, with 11 occurrences of the first pitch length (1), 20 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
- the arrangement of the tread elements 60 circumferentially around the tire 14 can have a moderating effect on the pattern noise. That is, pattern noise may be minimized by aligning the tread elements 60 in the sequences described herein and within the pitch ratio described herein. The result is lower noise output as a result of pavement contact when compared to other mud terrain or off-road tires.
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Abstract
A tire includes a tire carcass, and a tread extending circumferentially about the tire carcass and including a noise-reducing tread pattern. The noise-reducing tread pattern includes a plurality of tread elements, with the tread elements having a first pitch length (1), a second pitch length (2), or a third pitch length (3). The noise-reducing tread pattern includes one of the following circumferential configurations: a circumferential row including 40 pitches, with 13 occurrences of “1,” 13 occurrences of “2,” and 14 occurrences of “3;” a circumferential row including 38 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 9 occurrences of “3;” a circumferential row including 42 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 13 occurrences of “3;” and a circumferential row including 44 pitches, with 11 occurrences of “1,” 20 occurrences of “2,” and 13 occurrences of “3.”
Description
- The present disclosure relates generally to a noise-reducing tread pattern including a plurality of tread elements and, more particularly, to tread elements having one of three different pitches, which are configured circumferentially according to a particular pitch sequence.
- The mud terrain market is understood in the industry to apply to vehicles or machines where aggressive off-road usage is common or where usage in mud, rock, sand, and/or gravel predominates. Due to these aggressive applications, the tread elements of off-road tires are generally much larger to allow for improved survivability in conditions which are harsher than those experienced by passenger vehicles or other on-road vehicles. However, when vehicles with mud terrain tires are applied to on-road usage, these open and larger type tread elements may have a generally objectionable noise level as the tire contacts the road pavement at various speeds and vehicle loads.
- U.S. Pat. No. 9,327,558 to Stuckey et al. is agricultural related and directed to a tire including a tread extending circumferentially about a tire carcass. The tread includes a plurality of tread elements disposed in a tread pattern. The tread elements have one of two different pitch lengths and are disposed in a noise-reducing pitch sequence.
- As should be appreciated, there is a continuing need to improve performance, quality, reliability, and satisfaction of mud terrain tires. The present disclosure is directed to such an endeavor.
- In one aspect, a tire includes a tire carcass, and a tread extending circumferentially about the tire carcass and including a noise-reducing tread pattern. The noise-reducing tread pattern includes a plurality of tread elements, with the tread elements having a first pitch length (1), a second pitch length (2), or a third pitch length (3). The noise-reducing tread pattern includes one of the following circumferential configurations: a circumferential row including 40 pitches, with 13 occurrences of “1,” 13 occurrences of “2,” and 14 occurrences of “3;” a circumferential row including 38 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 9 occurrences of “3;” a circumferential row including 42 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 13 occurrences of “3;” and a circumferential row including 44 pitches, with 11 occurrences of “1,” 20 occurrences of “2,” and 13 occurrences of “3.”
- In another aspect, an off-road vehicle includes a frame, and a set of tires mounted on the frame and having a noise-reducing tread pattern. The noise-reducing tread pattern may include a plurality of tread elements, with the tread elements having a first pitch length, a second pitch length, or a third pitch length. The noise-reducing tread pattern includes one of the following circumferential configurations: a circumferential row including 40 pitches, with 13 occurrences of “1,” 13 occurrences of “2,” and 14 occurrences of “3;” a circumferential row including 38 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 9 occurrences of “3;” a circumferential row including 42 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 13 occurrences of “3;” and a circumferential row including 44 pitches, with 11 occurrences of “1,” 20 occurrences of “2,” and 13 occurrences of “3.”
- In yet another aspect, a method of manufacturing a mud terrain tire having a noise-reducing tread pattern is provided. The method includes forming a tread configured to extend circumferentially about a tire carcass, with the tread including the noise-reducing tread pattern. The noise-reducing tread pattern includes a plurality of tread elements, with the tread elements having a first pitch length (1), a second pitch length (2), or a third pitch length (3). The noise-reducing tread pattern includes one of the following circumferential configurations: a circumferential row including 40 pitches, with 13 occurrences of “1,” 13 occurrences of “2,” and 14 occurrences of “3;” a circumferential row including 38 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 9 occurrences of “3;” a circumferential row including 42 pitches, with 10 occurrences of “1,” 19 occurrences of “2,” and 13 occurrences of “3;” and a circumferential row including 44 pitches, with 11 occurrences of “1,” 20 occurrences of “2,” and 13 occurrences of “3.”
- Other features and aspects will be apparent from the following description and accompanying drawings.
-
FIG. 1 is a side diagrammatic view of an off-road vehicle, according to an exemplary embodiment of the present disclosure; -
FIG. 2 is a perspective view of a tire of the vehicle ofFIG. 1 , having a noise-reducing tread pattern in accordance with the present disclosure; -
FIG. 3 is a perspective view of the tread portion of the tire ofFIG. 2 ; -
FIG. 4 is a flattened tread section illustrating a portion of an exemplary noise-reducing tread pattern, according to the present disclosure; -
FIG. 5 is a flattened tread section of a single pitch of the noise-reducing tread pattern ofFIG. 4 , according to the present disclosure; -
FIG. 6 is a graphical representation of a harmonic spectrum analyzing an exemplary tire having a noise-reducing tread pattern according to the present disclosure; and -
FIG. 7 is a graphical representation of a harmonic spectrum analyzing an exemplary mono pitch tire. - Reference will now be made in detail to specific embodiments or features, examples of which are illustrated in the accompanying drawings. Wherever possible, corresponding or similar reference numerals will be used throughout the disclosure and accompanying drawings to refer to the same or corresponding parts.
- An exemplary off-
road vehicle 10 according to the present disclosure is shown generally inFIG. 1 . The off-road vehicle 10 may be any type of vehicle capable of driving on and off paved or gravel surfaces, for example. It is generally characterized by having large tires with deep, open treads. Generally speaking, the off-road vehicle 10 includes aframe 12 supporting a set oftires 14, which are mounted on theframe 12. Thetires 14 are configured to transfer the load of the off-road vehicle 10 to the ground through thetires 14, which may be mud terrain tires, or other similar off-road tires. Theframe 12 may also support anengine 16, an operator compartment orcab 18, and abody 20, along with various other systems and/or components. - Turning now to
FIG. 2 , anexemplary tire 14 of the present disclosure will be discussed in greater detail. Thetire 14 may be a pneumatic tire, for example, and may have any of a variety of different configurations and/or constructions. As shown in the exemplary embodiment, thetire 14 may include a carcass, or body, 30, having an axis of rotation A. Thecarcass 30, ortire 14, may generally include acrown 32, which may represent a center tread area of thetire 14 and may extend circumferentially about thecarcass 30. Afirst sidewall 34 may include a vertical portion of thetire 14 extending radially inwardly from thecrown 32 to afirst bead 36. On the opposite side of thetire 14, asecond sidewall 38 may be vertically oriented and may extend radially inwardly from thecrown 32 to asecond bead 40. First andsecond shoulders crown 32 meets the respective one of the first andsecond sidewalls second beads tire 14 in place on a rim or wheel (not shown). - The
crown 32, along with the first andsecond sidewalls tire chamber 46 suitable for containing a quantity of pressurized air in a conventional manner, such as, for example, by mounting the first andsecond beads tire carcass 30 may be of any suitable construction and may be made from any suitable materials. Examples of materials may include synthetic rubber, natural rubber, fabric and wire, along with carbon black and other chemical compounds. -
Tread 48, which may be formed about thetire carcass 30 and may extend circumferentially about the axis A of thetire carcass 30, is shown removed from the rest of thetire 14 inFIG. 3 . Thetread 48 may include a plurality of tread elements, or lugs, 60, and voids, or spaces, 62 between thetread elements 60. As shown, thetread elements 60 may project outwardly from thetire 14, with thevoids 62 being recessed relative to thetread elements 60. Treadelements 60 of a mud terrain tire, such astire 14, are typically larger than those of an on-road tire. Both thetread elements 60 and thevoids 62 may have any of a variety of different shapes, sizes, and/or configurations, with an arrangement of thetread elements 60 and thevoids 62 forming atread pattern 64 around thetire 14. - Turning now to
FIG. 4 , thetread pattern 64, which, as taught herein, is a noise-reducing tread pattern, 64, will be discussed in greater detail. The noise-reducingtread pattern 64 may be applicable to mud terrain type tread and other off-road tread. Thetread pattern 64 may include one or more circumferentially extendingrows tread elements 60 that form a loop pattern oftread elements 60 around the exterior of thetire 14. In addition, thetread 48 may be divided into a predetermined number of pitches P1, P2, P3 ofvarying pitch lengths tread element 60 and anadjacent void 62, as shown, and thepitch length shoulders tire 14, and each pitch P1, P2, P3 has a circumferential length corresponding to one of thepitch lengths pitch length 1 is shown inFIG. 5 . - According to the exemplary embodiment, the
tread 48 may be divided into 40 pitches P1, P2, P3 having threedifferent pitch lengths tread elements 60, and surroundingvoids 62, which make up the pitches P1, P2, P3, may have afirst pitch length 1, asecond pitch length 2, or athird pitch length 3 around thetire 14. Further, thefirst pitch length 1, thesecond pitch length 2, and thethird pitch length 3 may have a pitch ratio within a range of between about 0.85 to 1.15. For example, thefirst pitch length 1 may be approximately 85% of thesecond pitch length 2, which may be defined as 100%, and thethird pitch length 3 may be defined as 115% of thesecond pitch length 2. - The
tread elements 60 having thefirst pitch length 1 may be substantially identical, thetread elements 60 having thesecond pitch length 2 may be substantially identical, and thetread elements 60 having thethird pitch length 3 may be substantially identical. - The noise-reducing
tread pattern 64 of the present disclosure may include the circumferential arrangement of the pitches P1, P2, P3 according to particular pitch sequences. That is, as described below, thetread pattern 64 may include the pitches P1, P2, P3 arranged about thetire 14 such that a specific predetermined sequence is followed. Four exemplary circumferential configurations are provided below: - a) a circumferential row including 40 pitches, with 13 occurrences of the first pitch length, 13 occurrences of the second pitch length, and 14 occurrences of the third pitch length; wherein the circumferential row including 40 pitches, with 13 occurrences of the first pitch length (1), 13 occurrences of the second pitch length (2), and 14 occurrences of the third pitch length (3), includes the following pitch sequence:
- 1211223333321112123233321233221112112333;
- b) a circumferential row including 38 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 9 occurrences of the third pitch length; wherein the circumferential row including 38 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 9 occurrences of the third pitch length (3), includes the following pitch sequence:
- 12321223223323211112322332222212111232;
- c) a circumferential row including 42 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 13 occurrences of the third pitch length; and wherein the circumferential row including 42 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
- 232122233221121232333332222233322112321111.
- d) a circumferential row including 44 pitches, with 11 occurrences of the first pitch length, 20 occurrences of the second pitch length, and 13 occurrences of the third pitch length; wherein the circumferential row including 44 pitches, with 11 occurrences of the first pitch length (1), 20 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
- 33321122321223333222121123332322322111222121.
- The pitches P1, P2, P3, configured as described above and positioned about the
tire 14 according to one of the pitch sequences disclosed herein, may result in reduced noise levels generated by thetread pattern 64 as a result of pavement contact.FIG. 6 includes agraphical representation 80 of aharmonic spectrum 82 analyzing an exemplary tire, such astire 14, having the noise-reducingtread pattern 64 according to the present disclosure. Theharmonic spectrum 82 may be generated from a computer-based simulation of one of the above pitch sequences. For comparison,FIG. 7 is agraphical representation 90 of aharmonic spectrum 92 analyzing an exemplary mono pitch tire. As shown, the amplitude level corresponding to the noise-reducingtread pattern 64 inFIG. 6 may be significantly reduced versus that corresponding to the mono pitch tire inFIG. 7 . - The present disclosure relates generally to tires. More particularly, the present disclosure is directed to mud terrain tires and/or other off-road tires. Further, the present disclosure is directed to treads and tread patterns on tires, and reducing noise, or pattern noise, generated as a result of contact of the tire tread on pavement.
- The mud terrain market applies to vehicles or machines where aggressive off-road usage is common. Due to the aggressive application, the tread elements are generally much larger to allow for improved survivability in conditions which are harsher than those experienced by typical on-road vehicles. However, when vehicles with mud terrain tires are applied to on-road usage, these open and larger type tread elements may have a generally objectionable noise level as the tire contacts the road pavement at various speeds and vehicle loads.
- Referring generally to
FIGS. 1-7 , anexemplary tire 14 of the present disclosure may include acarcass 30 having an axis of rotation A. Thecarcass 30 may generally include acrown 32 extending circumferentially about thecarcass 30, afirst sidewall 34 extending radially inwardly from thecrown 32 to afirst bead 36, and asecond sidewall 38 extending radially inwardly from thecrown 32 to asecond bead 40. First andsecond shoulders crown 32 meets the respective one of the first andsecond sidewalls second beads tire 14 in place on a rim or wheel. -
Tread 48 may extend circumferentially about the axis A of thetire carcass 30, and may include a plurality oftread elements 60 and voids 62 between thetread elements 60. An arrangement of thetread elements 60 and thevoids 62 may form atread pattern 64, also referred to as a noise-reducing tread pattern, around thetire 14. The noise-reducingtread pattern 64 may be applicable to mud terrain type tread and other off-road tread. Thetread pattern 64 may be divided into a predetermined number of pitches P1, P2, P3, which may span laterally betweenshoulders pitch lengths pitch lengths tire 14. - That is, according to the exemplary embodiment, the noise-reducing
tread pattern 64 may include a plurality oftread elements 60, with thetread elements 60 having thefirst pitch length 1, thesecond pitch length 2, or thethird pitch length 3. Further, thefirst pitch length 1, thesecond pitch length 2, and thethird pitch length 3 may have a pitch ratio within a range of between about 0.85 to 1.15. For example, thefirst pitch length 1 may be approximately 85% of thesecond pitch length 2, which may be defined as 100%, and thethird pitch length 3 may be defined as 115% of thesecond pitch length 2. - The noise-reducing
tread pattern 64 of the present disclosure may include the circumferential arrangement of the pitches P1, P2, P3 according to particular pitch sequences. That is, thetread pattern 64 may include the pitches P1, P2, P3 arranged about thetire 14 such that a specific predetermined sequence ofpitch lengths - a) a circumferential row including 40 pitches, with 13 occurrences of the first pitch length, 13 occurrences of the second pitch length, and 14 occurrences of the third pitch length; wherein the circumferential row including 40 pitches, with 13 occurrences of the first pitch length (1), 13 occurrences of the second pitch length (2), and 14 occurrences of the third pitch length (3), includes the following pitch sequence:
- 1211223333321112123233321233221112112333;
- b) a circumferential row including 38 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 9 occurrences of the third pitch length; wherein the circumferential row including 38 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 9 occurrences of the third pitch length (3), includes the following pitch sequence:
- 12321223223323211112322332222212111232;
- c) a circumferential row including 42 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 13 occurrences of the third pitch length; and wherein the circumferential row including 42 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
- 232122233221121232333332222233322112321111.
- d) a circumferential row including 44 pitches, with 11 occurrences of the first pitch length, 20 occurrences of the second pitch length, and 13 occurrences of the third pitch length; wherein the circumferential row including 44 pitches, with 11 occurrences of the first pitch length (1), 20 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
- 33321122321223333222121123332322322111222121.
- The arrangement of the
tread elements 60 circumferentially around thetire 14 can have a moderating effect on the pattern noise. That is, pattern noise may be minimized by aligning thetread elements 60 in the sequences described herein and within the pitch ratio described herein. The result is lower noise output as a result of pavement contact when compared to other mud terrain or off-road tires. - It should be understood that the above description is intended for illustrative purposes only, and is not intended to limit the scope of the present disclosure in any way. Thus, those skilled in the art will appreciate that other aspects of the disclosure can be obtained from a study of the drawings, the disclosure and the appended claims.
Claims (20)
1. A tire having a noise-reducing tread pattern, including:
a tire carcass having an axis of rotation; and
a tread extending circumferentially about the tire carcass around the axis of rotation and including the noise-reducing tread pattern;
wherein the noise-reducing tread pattern includes a plurality of tread elements, with the tread elements having a first pitch length, a second pitch length, or a third pitch length; and
wherein the noise-reducing tread pattern includes one of the following circumferential configurations:
a circumferential row including 40 pitches, with 13 occurrences of the first pitch length, 13 occurrences of the second pitch length, and 14 occurrences of the third pitch length;
a circumferential row including 38 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 9 occurrences of the third
pitch length;
a circumferential row including 42 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 13 occurrences of the third pitch length; and
a circumferential row including 44 pitches, with 11 occurrences of the first pitch length, 20 occurrences of the second pitch length, and 13 occurrences of the third pitch length.
2. The tire of claim 1 , wherein the first pitch length, the second pitch length, and the third pitch length have a pitch ratio within a range of between about 0.85 to 1.15.
3. The tire of claim 1 , wherein the circumferential row including 40 pitches, with 13 occurrences of the first pitch length (1), 13 occurrences of the second pitch length (2), and 14 occurrences of the third pitch length (3), includes the following pitch sequence:
1211223333321112123233321233221112112333.
4. The tire of claim 1 , wherein the circumferential row including 38 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 9 occurrences of the third pitch length (3), includes the following pitch sequence:
12321223223323211112322332222212111232.
5. The tire of claim 1 , wherein the circumferential row including 42 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
232122233221121232333332222233322112321111.
6. The tire of claim 1 , wherein the circumferential row including 44 pitches, with 11 occurrences of the first pitch length (1), 20 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
33321122321223333222121123332322322111222121.
7. The tire of claim 1 , wherein the tread elements having the first pitch length are substantially identical, the tread elements having the second pitch length are substantially identical, and the tread elements having the third pitch length are substantially identical.
8. The tire of claim 1 , wherein the tread is a mud terrain type tread.
9. An off-road vehicle, including:
a frame; and
a set of tires mounted on the frame and having a noise-reducing tread pattern;
wherein the noise-reducing tread pattern includes a plurality of tread elements, with the tread elements having a first pitch length, a second pitch length, or a third pitch length; and
wherein the noise-reducing tread pattern includes one of the following circumferential configurations:
a circumferential row including 40 pitches, with 13 occurrences of the first pitch length, 13 occurrences of the second pitch length, and 14 occurrences of the third pitch length;
a circumferential row including 38 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 9 occurrences of the third
pitch length;
a circumferential row including 42 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 13 occurrences of the third pitch length; and
a circumferential row including 44 pitches, with 11 occurrences of the first pitch length, 20 occurrences of the second pitch length, and 13 occurrences of the third pitch length.
10. The off-road vehicle of claim 9 , wherein the first pitch length, the second pitch length, and the third pitch length have a pitch ratio within a range of between about 0.85 to 1.15.
11. The off-road vehicle of claim 10 , wherein the circumferential row including 40 pitches, with 13 occurrences of the first pitch length (1), 13 occurrences of the second pitch length (2), and 14 occurrences of the third pitch length (3), includes the following pitch sequence:
1211223333321112123233321233221112112333.
12. The off-road vehicle of claim 10 , wherein the circumferential row including 38 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 9 occurrences of the third pitch length (3), includes the following pitch sequence:
12321223223323211112322332222212111232.
13. The off-road vehicle of claim 10 , wherein the circumferential row including 42 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
232122233221121232333332222233322112321111.
14. The off-road vehicle of claim 10 , wherein the circumferential row including 44 pitches, with 11 occurrences of the first pitch length (1), 20 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
33321122321223333222121123332322322111222121.
15. The off-road vehicle of claim 10 , wherein the tread elements having the first pitch length are substantially identical, the tread elements having the second pitch length are substantially identical, and the tread elements having the third pitch length are substantially identical.
16. A method of manufacturing a mud terrain tire having a noise-reducing tread pattern, the method including steps of:
forming a tread configured to extend circumferentially about a tire carcass and including the noise-reducing tread patterns;
wherein the noise-reducing tread pattern includes a plurality of tread elements, with the tread elements having a first pitch length, a second pitch length, or a third pitch length; and
wherein the noise-reducing tread pattern includes one of the following circumferential configurations:
a circumferential row including 40 pitches, with 13 occurrences of the first pitch length, 13 occurrences of the second pitch length, and 14 occurrences of the third pitch length;
a circumferential row including 38 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 9 occurrences of the third
pitch length;
a circumferential row including 42 pitches, with 10 occurrences of the first pitch length, 19 occurrences of the second pitch length, and 13 occurrences of the third pitch length; and
a circumferential row including 44 pitches, with 11 occurrences of the first pitch length, 20 occurrences of the second pitch length, and 13 occurrences of the third pitch length.
17. The method of claim 16 , wherein the circumferential row including 40 pitches, with 13 occurrences of the first pitch length (1), 13 occurrences of the second pitch length (2), and 14 occurrences of the third pitch length (3), includes the following pitch sequence:
1211223333321112123233321233221112112333.
18. The method of claim 16 , wherein the circumferential row including 38 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 9 occurrences of the third pitch length (3), includes the following pitch sequence:
12321223223323211112322332222212111232.
19. The method of claim 16 , wherein the circumferential row including 42 pitches, with 10 occurrences of the first pitch length (1), 19 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
232122233221121232333332222233322112321111.
20. The method of claim 16 , wherein the circumferential row including 44 pitches, with 11 occurrences of the first pitch length (1), 20 occurrences of the second pitch length (2), and 13 occurrences of the third pitch length (3), includes the following pitch sequence:
33321122321223333222121123332322322111222121.
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0541004A1 (en) * | 1991-11-02 | 1993-05-12 | Continental Aktiengesellschaft | Construction part in circular movement with a "pitch" sequence |
US6651712B1 (en) * | 1999-06-10 | 2003-11-25 | The Goodyear Tire & Rubber Company | Variable pitched tread for ATV tire |
US20160347122A1 (en) * | 2013-06-19 | 2016-12-01 | Bridgestone Americas Tire Operations, Llc | Tire With Noise-Reducing Tread Pattern |
-
2017
- 2017-07-24 US US15/657,620 patent/US10967682B2/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0541004A1 (en) * | 1991-11-02 | 1993-05-12 | Continental Aktiengesellschaft | Construction part in circular movement with a "pitch" sequence |
US6651712B1 (en) * | 1999-06-10 | 2003-11-25 | The Goodyear Tire & Rubber Company | Variable pitched tread for ATV tire |
US20160347122A1 (en) * | 2013-06-19 | 2016-12-01 | Bridgestone Americas Tire Operations, Llc | Tire With Noise-Reducing Tread Pattern |
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